Derrick.



W. F. CUMMINGS.

pERmcK. APPLICATION FILED MAY 29. I9l5.

1,284,637. Patented July 24, 1917.

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UNITED STATES PATENT OFFICE.

WILLIAM F. CUMMINGS, OF CHICAGO, ILLINOIS.

DERRICK.

To all whom it may concern:

Be it known that I, WILLIAM F. CUM- MINGS, a citizen of the UnitedStates, residing at Chicago, in the county of Cook and State ofIllinois, have invented certain new and useful Improvements in Derricks,of which the following is a specification.

My invention relates to improvements in portable derricks and moreparticularly to a derrick to be used for erecting telephone andtelegraph poles.

A derrick or pole erector for setting telegraph poles, trolley wirepoles and the like must necessarily be constructed to permit passagethrough the streets of a city where overhead obstructions, such asbridges, trolley wires, etc., are encountered. For this reason thederrick must be either comparatively short and consequently inefficient,or if of any considerable height, must be provided with some meanswhereby the mast may be shortened or lowered for transportation from onejob to another.

One of the objects of my invention is to provide a collapsible derrickmounted on the bed of an ordinary wagon and of a suflicient height whenerected to handle, readily, long unwieldy objects, such as telegraphpoles and the like.

Another object of my invention is to provide a collapsible derrick thatmay quickly and readily be elevated for use or lowered fortransportation from one job to another.

Other and further objects will become readily apparent to those skilledin the art from a consideration of the specification and drawingswherein Figure 1 is a side elevation of my portable derrick.

Fig. 2 is a horizontal sectional view on line 2-2 of Fig. 1. I

Fig. 3 is a vertical sectional view on the line 3-3 of Fig. 1.

Fig. 4 is an enlarged vertical sectional view on the line 44 of Fig. 1.

Fig. 5 is an enlarged vertical sectional view onthe line 55 of Fig. 1.

Fig. 6 is an enlarged horizontal sectional view on the line 66 of Fig.1.

Fig. 7 is an enlarged sectional view of the line 77 of Fig. 1, and;

Fig. 8 is an enlarged detail view of the tackle support used in erectingthe mast.

In general my apparatus comprises a vehicle, the running gear of whichis designated by the numeral 10, having a wagon Specification of LettersPatent. Patented J 1y 24 1Q-17.

Application filed May 29, 1915.

Serial No. 31,133.

box 11 in the center of which is stepped the mast 12. A collar 13, openat'its rear side, embraces the mast at a point elevated from thewagonbox and is rigidly braced by three channel bars running downwardly tothe sides and front of the wagon box, a fourth brace readily movableinto or out of position, extends upwardly from the rear end of the wagonbox closing the opening in the collar 13. From the upper end of the mastan armextends outwardly to one side for carrying the post elevatingtackle.

A hinged extension is provided on the front brace so that when extendedit projects above the mast supporting collar and provides a support forthe block and tackle used in raising the mast to a Vertical position forstepping in the wagon body or lowering it for transportation.

To describe the apparatus more in detail,

the derrick proper comprises a tubular mast 12, the lower end of whichrests in a step 14 bolted to the floor 15 of the wagon box 11. The upperend of the mast carries an'elbow 16 from which projects a horizontaltubular arm 17 on the end of which is carried suitable pole elevatingtackle. This may comprise a band 18 clamped on theendof the arm 17 andcarrying a hook 19 from which may be suspended a block and tackle 19. Inthe preferred formI also employ a cable 20 which passes through thetubular mast and arm, the lower end extending to the rear of the vehiclepermitting the utilization of a draft animal for raising the pole.

The cable 20 passes inwardly at the open.

outer end of the arm 17, over the sheave 21 and is then deflecteddownwardly into the vertical mast 12 over a sheave 22 carried in theelbow 16. An opening 23 is provided in the floor of the wagon bodyinside the step 14 through which the cable projects downwardly andaround a sheave 24 mounted on 1 A fourth channel bar 30 is pivoted onthe bolt 31 to the center of the rear edge of the floor 15 and at itsupper end carries a plate 32 adapted to fit within the open end of theU-shaped collar 13 and complete the mast encircling support. When themast is swung into position a bolt 33 is inserted through openings inthe ends of the U-shaped collar 13 and corresponding openings in theupper end of the brace 30 securely fastening the same in place.

To aid in erecting and lowering the mast 12. I have provided anextension of the brace 26 in the form of a T-bar 34 hinged at 35 to theupper portion of the brace 26. When elevated the extension 34 liesagainst the upper end of the brace 26 as illustrated in dotted lines atFig. 1, its projecting end carrying a fork 37 in vertical alinement withthe mast collar 13 and step 14. At one side of the fork 37 projects apin or stud 38 to which is attached the mast raising and lowering blockand tackle indicated in Fig. 1 in dotted lines at 39. For convenience inworking upon the structure I have provided suitable ladder rungs 40 onthe brace 26 and extension 34.

In carrying the apparatus from place to place the mast is laid on thebody of the wagon, a portion projecting from the rear end, and carriedto the point where a pole is to be erected. The extension 34 is thenelevated to the position shown in dotted lines in Fig. 1 and the blockand tackle 39 attached to the stud 38. The lower block is secured to themast at a point slightly above the center of gravity and is then raisedto a vertical position, the lower end being guided by a workman until itrests in the step 14 When in this position the upper portion of the mastslides into the open mouth of collar 13, the fork 37 also acting as aguide, and the stud 30 is swung into place, closing the opening incollar 13. The extension 34 is then folded down into the position shownin full lines in Fig. 1 and the block and tackle attached to hook 19 atthe end of the arm 17 for use in erecting the pole, or if a draft animalis to be used, the

block and tackle may be dispensed with and the upper end of the cable 20secured to the pole.

After a job is finished the dismantling or collapsing of the derrick isreadily accom plished by reversing the order of events above described.

Having described my invention, what I claim is:

1. The combination with a vehicle, of a derrick comprising a mastadapted to be stepped on said vehicle, an open sided collar adapted toengage and retain the mast in erected position, braces carried by thevehicle extending upwardly to said collar and sion pivotally connectedto one of the braces and when elevated projecting above the col- Ylar; afork carried on the upper end of said extension and adapted to engagethe mast when the same is in vertical position, and mast elevating meanscarried by said extension.

3. The combination with a vehicle, of a derrick comprising a mastadapted to be stepped on said vehicle, a collar open at one side andadapted to engage and retain the mast in erected position, permanentbraces carried by the front and sides of the vehicle extending upwardlyto said collar, said collar having its rear side open, a removable braceextending from the rear of the vehicle up to the collar and adapted whenin place to close the open side thereof, an extension pivotallyconnected to the front brace and adapted when elevated to project abovesaid collar, and means carried by the upper end of the said extensionfor elevating and lowering said mast.

In testimony whereof I hereunto set my hand in the presence of twosubscribing witnesses;

.WILLIAM F. CUMMINGS.

In the presence of- FomiE BAIN, MARY F. ALLEN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents.

Washington, D. 0.

